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| Number | Title | Issue Date |
| 8078053 | Optical link characterization Various example embodiments are disclosed. According to one example embodiment, a method may include transmitting a semiconductor laser-generated optical signal from a first end of a multi-mode fiber (MMF) optical link to a second end of the link. The optical signal... | 12/13/2011 |
| 8059958 | Measurement of polarization dependent loss in an optical transmission system A method is provided for measuring polarization dependent loss in an optical transmission system. In the method, a first optical signal is generated, and a polarization of the first optical signal is altered over time. The first optical signal is combined with a sec... | 11/15/2011 |
| 7945159 | Diagnostic method and diagnostic chip for determining the bandwidth of optical fibers The present invention provides a method for determining the bandwidths of optical fibers, wherein the method provides the coupling of light with a first optical power and a first modulation frequency into an optical fiber, as well as measuring a first signal level a... | 05/17/2011 |
| 7873273 | Apparatus for measuring the characteristics of an optical fiber An apparatus for measuring the characteristics of an optical fiber is provided. An optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval which is equal to or shorter tan a life time of an acoustic wave in th... | 01/18/2011 |
| 7630633 | Optical bit stream reader system and method An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 12/08/2009 |
| 7558479 | Analysis and control of optical communications systems An optical communications system has a plurality of spans between a transmitter and a receiver. The receiver has optical to electrical conversion circuitry for converting the received optical signal to an electric signal, analogue to digital conversion circuitry and... | 07/07/2009 |
| 7469101 | Optoelectronic marker for determining ownership of fiber optic cable A passive optical arrangement for indicating the presence of a change in ownership along a fiber optic cable span uses an attenuation unit at a splice location that will severely attenuate an optical signal propagating along the span at a predetermined “marker” ... | 12/23/2008 |
| 7440695 | Optical transmission line monitoring system using a gain clamped optical amplifier There are provided a method and system for monitoring an optical transmission line. The system for monitoring the optical transmission line includes: an OTDR (optical time-domain reflectometer) transmitting a monitoring light to an optical transmission line, measuri... | 10/21/2008 |
| 7437068 | Optical communication link An optical communication link has a plurality of light emitting elements and a plurality of light receiving elements associated with the respective light emitting elements, and a plurality of optical fibers each for conveying an optical signal emitted from one light... | 10/14/2008 |
| 7424191 | System for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light... | 09/09/2008 |
| 7403674 | Intrusion detection system for a multimode optical fiber using a bulk optical wavelength division multiplexer for maintaining modal power distribution Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in ... | 07/22/2008 |
| 7403675 | Method of high order mode excitation for multimode intrusion detection Intrusion detection for a multimode fiber optic cable uses a light signal launched into the fiber through the low ratio leg of a tap coupler to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the cable. A small portion of... | 07/22/2008 |
| 7391969 | Method and apparatus for pulse generation and adaptive pulse generation for optical communications One embodiment of the invention relates to producing optical pulses for use on a transmission link. A light source is configured to produce an optical signal. A pulse generator is coupled to the light source. The pulse generator is configured to receive, for a first... | 06/24/2008 |
| 7376293 | Remote location of active section of fiber in a multimode intrusion detection system Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in ... | 05/20/2008 |
| 7369777 | Method and apparatus for automatically adjusting the optical power directed to a dispersion compensating element A dispersion compensator is provided that includes an input port 102 for receiving a WDM optical signal and a dispersion compensating element 110 coupled to the input port for substantially compensating the WDM optical signal for dispersion that has ac... | 05/06/2008 |
| 7366421 | Single-to-multi mode converter and optical code division multiple access system using the same A single-to-multi mode converter and an optical code division multiple access system using the same. The mode converter includes first, second, and third optical waveguides. The first optical waveguide is formed of a single-mode optical fiber and outputs a single-mo... | 04/29/2008 |
| 7359634 | Light color recognition for optical connection verification Optical connection verification schemes that do not cause electromagnetic interference. An all-optical connection verification scheme exploits optical coding based on a standard color scale such as RGB (red, green, blue). An RGB LED source is used to launch a three-... | 04/15/2008 |
| 7348530 | System, method and apparatus for regulating the light emitted by a light source In one embodiment, apparatus is provided with a light source, an optic element, at least one photosensor, and a control system. The optic element has a reflective material on a surface thereof, and is positioned to receive and reflect light emitted by the light sour... | 03/25/2008 |
| 7313626 | Operations and maintenace architecture for multiprotocol distributed system The present disclosure is directed to an open access Network Management System (NMS) that provides multiple tenants in an open access wireless distribution system with an appropriate level of access and control over the system elements that carry their signaling. Fo... | 12/25/2007 |
| 7305183 | Measurement of polarization dependent loss in an optical transmission system A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical co... | 12/04/2007 |
| 7289698 | High bitrate transport over multimode fibers A multimode fiber system includes a transmitter for transmitting an optical signal and a receiver that receives the optical signal. At least one mode filter is coupled between the receiver and the transmitter and passes only a specific set of fiber modes from the tr... | 10/30/2007 |
| 7289707 | Multi-core optical fiber image amplifier and method of drawing A low-noise, high-gain optical image amplifier includes a multi-mode pump source that injects optical energy into an active fiber's inner cladding to excite the dopant ions in a 2-D array of doped cores and provide gain. The cores are arranged to sample and collect ... | 10/30/2007 |
| 7289729 | Optoelectronic marker for determining ownership of fiber optic cable A passive optical arrangement for indicating the presence of a change in ownership along a fiber optic cable span uses an attenuation unit at a splice location that will severely attenuate an optical signal propagating along the span at a predetermined “marker” ... | 10/30/2007 |
| 7257325 | Method and system for monitoring multiple optical communications lines The present invention provides a method and system for monitoring composite optical signals carried over plural fiber-optic lines within an optical network. Methods and systems in accordance with the present invention each utilize a single OPM to monitor each one of... | 08/14/2007 |
| 7248798 | Method and system for identification of channels in an optical network A method and system for identification of a channel in an optical network is provided. The channel is identified by the use of unique combinations of two or more low frequencies, or tones, modulated onto the channel and optionally, a network parameter associated wit... | 07/24/2007 |
| 7233739 | Optical bit stream reader system An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 06/19/2007 |
| 7197242 | Chromatic-dispersion measuring apparatus and method The present invention provides a chromatic-dispersion measuring apparatus and method that can quickly measure chromatic dispersion in an optical fiber even when the optical fiber is short. Continuous light beams having the wavelengths λ1 and λ2 | 03/27/2007 |
| 7194180 | Fiber detector apparatus and related methods A fiber detector apparatus includes a hub having one or more electrical contacts. The hub is configured to be placed against a connector, which is disposed on an electromagnetic energy source, such that electrical continuity is established between the electrical con... | 03/20/2007 |
| 7181137 | Subband spectrum analysis for optical multiplex section protection The spectrum of a received WDM band or subband is analyzed to detect failure of, e.g., fiber or amplifiers along a line. In one implementation, measurements are taken within the optical spectrum at locations of expected data-carrying optical signals and at two locat... | 02/20/2007 |
| 7171130 | Optical performance monitor utilizing nonlinear detection An optical performance monitor particularly well-suited for use in dense wavelength-division multiplexed (DWDM) systems includes both a nonlinear optical detector and a conventional linear detector. The nonlinear optical detector, which may comprise a quadratic dete... | 01/30/2007 |
| 7158789 | Communication network in particular for telephony A communications network, in particular for telephony, comprises at least one operator a plurality of remote units for exchanging signals with mobile terminals and an interface unit for controlling the data traffic between the operator and the remote units. The inte... | 01/02/2007 |
| 7155121 | Method and apparatus for providing controlled impairments to an optical transport system An optical stream is split into a primary optical stream and a secondary optical stream. The secondary optical stream is converted to an electrical signal. The electrical signal is processed to identify a particular portion of the optical stream. The primary optical... | 12/26/2006 |
| 7146085 | Method and system for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber, method of manufacturing optical fibers, method of measuring wavelength-dispersion distribution, method of compensating for measurement errors, and method of specifying conditions of measurement A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light... | 12/05/2006 |
| 7139478 | Nonlinear device comprising a spectrally broadening fiber Embodiments of the invention include system for monitoring the effectiveness of pulse shaping in a nonlinear optical fiber (40). The spectral content of the pulse, after passing through the nonlinear fiber (40), provides an indication of how effectivel... | 11/21/2006 |
| 7120324 | Intrusion detection system for use on an optical fiber using a translator of transmitted data for optimum monitoring conditions A method and system of intrusion detection system for a multimode fiber optic cable. A light signal is launched into the cable fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the cable. A small portion of the hig... | 10/10/2006 |
| 7103283 | Transmission characteristic compensation control system A transmission characteristic compensation system enables to reduce the generation of transmission deterioration by estimating an initially selected control direction, and also to compensate in advance with a setting value estimation so as to suppress the generation... | 09/05/2006 |
| 7068932 | Method and system for automatic initialization of an optical network A method for automatic initialization of an optical network is provided. A network management system (NMS) performs remote determination of span losses and sets the operating points of network components. The initialization method comprises remotely and automaticall... | 06/27/2006 |
| 7068945 | Optical amplifying and repeating method and optical amplifying and repeating system A method includes taking backscattering light of a first wavelength in a first direction of a first transmission line and coupling the same so that the light may travel in a second direction of a second transmission line; taking a second wavelength in the first dire... | 06/27/2006 |
| 7068912 | Fiber detector apparatus and related methods A fiber detector apparatus includes a hub having one or more electrical contacts. The hub is configured to be placed against a connector, which is disposed on an electromagnetic energy source, such that electrical continuity is established between the electrical con... | 06/27/2006 |
| 7061947 | Partially mirrored beam tap for wavelength lockers A partially mirrored beam tap for use in wavelength and power monitoring, wherein the partially mirrored beam tap splits off at least two beams from an elliptical Gaussian output beam, wherein a first split-off beam is transmitted to an etalon and one or more first ... | 06/13/2006 |
